9
EVAPORATOR & CONDENSER BLOWER MOTOR ASSEMBLIES
Each 1 and 1½ ton unit is equipped with a new technology external rotor,
forward curved, squirrel cage blower for the evaporator and condenser sec-
tions. The external rotor motor is totally enclosed, PSC, thermally protected,
2-speed, with sealed ball bearings, and dynamically balanced in 2 planes for
reduced noise/vibration levels. The blower wheel is bolted to the rotating
stator section, eliminating set screws. The double inlet design puts the motor
section in the center of the wheel, leaving both air inlets free of any motor
obstruction and in the air stream for cool efficient operation, unlike standard
direct drive blowers. No oiling or mechanical servicing is required.
MAC60/90 models utilize belt drive blowers/motors which provide the increased air flow at very moderate noise
levels. All motor pulleys are keyed to the shaft and secured with tapered style bushings. Blower pulleys are secured
with tapered bushings, eliminating the need for set screws.
The motors are solidly bolted to the motor mounting plate. Adjustment and belt tension are easily set by raising or
lowering the plate and tightening the adjustment bolts.
Motor mounting plate
Adjustment rods
Belt adjustment/replacement is easy. Just
loosen the nuts on the top and bottom of
the motor plate, roll off the old belt...roll
on the new one… tighten the bolts to ap-
ply tension to the belt and motor plate.
Lock nuts on top and bottom
of motor mounting plate
MAC60 condenser blower
MAC60 evaporator blower
Inside view of MAC90
showing the arrangement of
internal components.
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